The possibility of detection of small absorption in HTS thin films by means of the highly sensitive OFC magnetometer

A single-layer flat-coil-oscillator (SFCO)-based super-broadband position sensor for nano-scale-resolution seismometry

“…It can be used for determination of small changes of distances with Dd$1-10 Å absolute and Dd/d$10 À5 -10 À6 relative resolution (depending on the model and working temperature of the oscillator in the range of 3-300 K) [3]. It is also a sensitive radio-frequency (rf) Q-meter to study absorption as small as 10 À9 W in thin flat materials (for example, in superconductive materials [5,6]). The method can operate down to liquid-4 He temperatures.…”

“…Besides, due to the flat shape even small shift of the position of a normal-conducting plate, placed near the coil, may lead to a strong distortion of the field distribution around the coil. These features and the stability of TD oscillators (DF stab $2À10 Hz, DF/F$10 À6 À10 À7 -depending on model and temperature [8][9][10]) enabled us to reach 6 orders relative resolution in the SFCO technique [2,3], permitting to detect weakly expressed effects in high-T c superconductive (HTSC) materials [5,6,11].…”

Newly-Proposed Methods for Early Detection of Incoming Earthquakes, Tsunamis & Tidal Motion

“…It can be used for determination of too much little changes of distances with d~1-10Å absolute and d/d~10  5 -10  6 relative resolution (depending on a model and working temperature of the TD-oscillator [3][4]. It is also a sensitive radio-frequency (RF) Q-meter  to study absorption as small as 10  9 W in thin flat materials (for example, in plate-like high-T c superconductors [5][6][7]). The SFCO method can operate down to the liquid 4 He temperatures.…”

“…Besides, due to flat shape, even a little shift of the position of a normal-conducting plate, placed near the coil, may www.intechopen.com lead to strong distortion of the field distribution around the coil. These features, and the stability of TD-oscillators (F stability 1-10Hz, F/F10  7 -10  6  depending on the model & temperature  see [2,[11][12]) enabled us to reach 6 orders relative resolution in SFCO technique [3][4], permitting to effectively use it in a basic research [5][6][7][8], as well as in some modern technical applications [9][10]. In the last case, frequency of the oscillator is mainly used as a testing parameter, and the measuring effect is determined by a distortion of the MHz-range testing field configuration near the coil face by the vibrating copper plate, leading to the magnetic inductance changes of the coil, with a resolution  1-10pH (depending on operation temperature of a technique), resulting in the changes of test oscillator frequency.…”

“…ment of the resolution of measurements by 3-4 orders of magnitude (especially, in studies of thin, plate-like HTS materials [1,[3][4][5][6][7][8]). For comparison, typical values of the filling factor for solenoid coils are 10  4 10  3 for the said samples.…”